IMPACT FORCES EXERTED BY THE MOTOR TRUCK ON THE HIGHWAY

MEASUREMENT WAS MADE OF THE VERTICAL REACTION BETWEEN THE ROAD AND THE WHEEL AND DETERMINATION OF THE INFLUENCES OF TIRE EQUIPMENT, LOAD, SPEED AND ROAD SURFACE ROUGHNESS. MEASUREMENTS SHOW THE FOLLOWING RESULTS: (1) AS STATIC LOAD INCREASES, LOAD IMPACT REACTION INCREASES, (2) AS STATIC LOAD INCREASES, THE RATIO OF ROAD IMPACT TO STATIC LOAD DECREASES, (3) THICKNESS AND NARROWNESS OF TREND RUBBER ARE DESIREABLE IN REDUCING ROAD IMPACT REACTION, (4) INCREASING THE THICKNESS OF PROFILE HEIGHT OF RUBBER HAS A VERY MARKED EFFECT IN REDUCING ROAD IMPACT REACTION IN BOTH SINGLE AND DUAL MOUNTINGS, (5) IN THE TIRE EQUIPMENT TESTED ALL OF WHICH WERE STANDARD AT THE TIME OF THE TEST, DUAL MOUNTING CAUSED HEAVIER IMPACT FORCES THAN THE CORRESPONDING SINGLE MOUNTING OF THE SAME TOTAL LOAD-CARRYING CAPACITY, (6) APPRECIABLE VARIATION OF CROSS-SECTIONAL RUBBER, OR BREAKS IN ITS CONTINUITY, CAUSE HEAVY REPEATED IMPACTS TO BE DELIVERED TO THE ROAD, AND (7) DUAL MOUNTED TIRES SHOULD ALWAYS BE MOUNTED WITH THE TREND DESIGN STAGGERED. AUXILIARY TO THE TRUCK IMPACT TESTS, THE ACTION OF THE TIRES UNDER STATIC LOADS IS MEASURED AND RECORDED. A CONVENTIONAL TESTING MACHINE WAS MODIFIED TO CONVENIENTLY DETERMINE THE VERTICAL DEFLECTION, THE CONTACT WIDTH, AND THE CONTACT AREA OF THE TIRE AS THE LOAD WAS SLOWLY APPLIED. THERE ARE FOUR MAJOR FACTORS WHICH INFLUENCE VERTICAL IMPACT FORCES OF THE TRUCK ON THE ROAD: TIRE EQUIPMENT, WHEEL LOAD, SPEED, AND ROAD ROUGHNESS.

  • Supplemental Notes:
    • Vol 6, pp 175-184, 9 FIG, 1 TAB
  • Authors:
    • BUCHANAN, J A
  • Publication Date: 1927

Media Info

  • Monograph Title: Proceedings of the Sixth Annual Meeting of the Highway Research Board Held at Washington, D.C., December 2-3, 1926
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207139
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 11 1971 12:00AM